StartupLOG::
->record = ReadCheckpointRecord(xlogreader, ControlFile->checkPoint, 1, true)
->record = ReadRecord(xlogreader, ControlFile->checkPoint, LOG, true)
->record = XLogReadRecord(xlogreader, ControlFile->checkPoint, &errormsg);
->readOff = ReadPageInternal(state,ControlFile->checkPoint - (ControlFile->checkPoint % XLOG_BLCKSZ), Min(ontrolFile->checkPoint % XLOG_BLCKSZ + SizeOfXLogRecord, XLOG_BLCKSZ));
->|--pageptr=ControlFile->checkPoint - (ControlFile->checkPoint % XLOG_BLCKSZ)
  |--targetPageOff = (pageptr % XLogSegSize);//段文件偏移
  |--targetSegmentPtr = pageptr - targetPageOff;
  |--readLen = state->read_page(state, targetSegmentPtr(0?), XLOG_BLCKSZ,ControlFile->checkPoint, state->readBuf, &state->readPageTLI);
->WaitForWALToBecomeAvailable(targetSegmentPtr(0?) + XLOG_BLCKSZ,private->randAccess,1,targetRecPtr)
->readFile = XLogFileReadAnyTLI(targetSegmentPtr/XLogSegSize, DEBUG2,currentSource == XLOG_FROM_ARCHIVE ? XLOG_FROM_ANY :currentSource)
->fd = XLogFileRead(segno, emode, tli,XLOG_FROM_ARCHIVE或者XLOG_FROM_PG_WAL, true)
->fd = BasicOpenFile(path, O_RDONLY | PG_BINARY, 0);
->fd = open(fileName, fileFlags, fileMode)

另外有需要云服务器可以了解下创新互联scvps.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。

创新互联建站是专业的诏安网站建设公司，诏安接单;提供做网站、网站制作,网页设计,网站设计,建网站,PHP网站建设等专业做网站服务;采用PHP框架,可快速的进行诏安网站开发网页制作和功能扩展;专业做搜索引擎喜爱的网站,专业的做网站团队,希望更多企业前来合作!
分享标题：PostgreSQL启动恢复通过checkpointopenwal文件-创新互联
本文地址：http://lswzjz.com/article/cdhspe.html